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COST OF REVENUE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cost of Revenue [Abstract]      
Compensation and benefits $ 200,486 $ 240,487 $ 264,796
Outside fees and services 278,380 325,459 301,116
Cost of real estate sold 47,659 24,398 1,040
Reimbursable expenses 30,039 39,912 52,011
Technology and telecommunications 41,588 42,340 44,295
Depreciation and amortization 24,013 27,269 26,787
Total $ 622,165 $ 699,865 $ 690,045